Why do people have to become buddhas?

Any living thing develops from simple to complex, from low to high, from single cell to multi-cell, from low dimension to high dimension. As a part of living things, people are no exception. The development of Buddha from our life level to a higher life level (Nirvana) shows us such a process and possibility, points out the direction of our development, and tells us that if we take this road (practice), we can reach our destination (become a Buddha), but if we stay where we are and live our present life, it is not necessarily impossible.

-So people don't have to become Buddhas, but Buddhas represent a higher direction of life development. People who want to go forward with Buddhas (predestined friends) are naturally willing to go with Buddhas.

But, brother, after reading your supplementary materials, I think you should go to see a popular science film "The Law of Attraction" made abroad, which expounds a very important point, that is, the power of the heart. This film points out that everyone and everything you meet are attracted by your heart and come to help you grow and make up lessons. You should be grateful for keeping yourself going.